单项选择题

A．do not exist
B．did not exist
C．haven’t existed
D．had not existed
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单项选择题
A．by whichB．from whichC．on whichD．which
A．by which
B．from which
C．on which
D．which
单项选择题
A．possibleB．it possibleC．impossibleD．us possible
A．possible
B．it possible
C．impossible
D．us possible
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